[15273] | 1 | /* obstack.h - object stack macros |
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[16930] | 2 | Copyright (C) 1988-1999, 2000 Free Software Foundation, Inc. |
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[15273] | 3 | |
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| 4 | |
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| 5 | NOTE: The canonical source of this file is maintained with the GNU C Library. |
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[16930] | 6 | Bugs can be reported to bug-glibc@gnu.org. |
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[15273] | 7 | |
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| 8 | This program is free software; you can redistribute it and/or modify it |
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| 9 | under the terms of the GNU General Public License as published by the |
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| 10 | Free Software Foundation; either version 2, or (at your option) any |
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| 11 | later version. |
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| 12 | |
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| 13 | This program is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |
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| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with this program; if not, write to the Free Software |
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| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
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| 21 | USA. */ |
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| 22 | |
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| 23 | /* Summary: |
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| 24 | |
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| 25 | All the apparent functions defined here are macros. The idea |
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| 26 | is that you would use these pre-tested macros to solve a |
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| 27 | very specific set of problems, and they would run fast. |
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| 28 | Caution: no side-effects in arguments please!! They may be |
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| 29 | evaluated MANY times!! |
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| 30 | |
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| 31 | These macros operate a stack of objects. Each object starts life |
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| 32 | small, and may grow to maturity. (Consider building a word syllable |
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| 33 | by syllable.) An object can move while it is growing. Once it has |
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| 34 | been "finished" it never changes address again. So the "top of the |
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| 35 | stack" is typically an immature growing object, while the rest of the |
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| 36 | stack is of mature, fixed size and fixed address objects. |
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| 37 | |
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| 38 | These routines grab large chunks of memory, using a function you |
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| 39 | supply, called `obstack_chunk_alloc'. On occasion, they free chunks, |
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| 40 | by calling `obstack_chunk_free'. You must define them and declare |
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| 41 | them before using any obstack macros. |
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| 42 | |
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| 43 | Each independent stack is represented by a `struct obstack'. |
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| 44 | Each of the obstack macros expects a pointer to such a structure |
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| 45 | as the first argument. |
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| 46 | |
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| 47 | One motivation for this package is the problem of growing char strings |
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| 48 | in symbol tables. Unless you are "fascist pig with a read-only mind" |
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| 49 | --Gosper's immortal quote from HAKMEM item 154, out of context--you |
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| 50 | would not like to put any arbitrary upper limit on the length of your |
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| 51 | symbols. |
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| 52 | |
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| 53 | In practice this often means you will build many short symbols and a |
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| 54 | few long symbols. At the time you are reading a symbol you don't know |
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| 55 | how long it is. One traditional method is to read a symbol into a |
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| 56 | buffer, realloc()ating the buffer every time you try to read a symbol |
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| 57 | that is longer than the buffer. This is beaut, but you still will |
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| 58 | want to copy the symbol from the buffer to a more permanent |
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| 59 | symbol-table entry say about half the time. |
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| 60 | |
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| 61 | With obstacks, you can work differently. Use one obstack for all symbol |
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| 62 | names. As you read a symbol, grow the name in the obstack gradually. |
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| 63 | When the name is complete, finalize it. Then, if the symbol exists already, |
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| 64 | free the newly read name. |
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| 65 | |
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| 66 | The way we do this is to take a large chunk, allocating memory from |
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| 67 | low addresses. When you want to build a symbol in the chunk you just |
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| 68 | add chars above the current "high water mark" in the chunk. When you |
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| 69 | have finished adding chars, because you got to the end of the symbol, |
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| 70 | you know how long the chars are, and you can create a new object. |
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| 71 | Mostly the chars will not burst over the highest address of the chunk, |
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| 72 | because you would typically expect a chunk to be (say) 100 times as |
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| 73 | long as an average object. |
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| 74 | |
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| 75 | In case that isn't clear, when we have enough chars to make up |
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| 76 | the object, THEY ARE ALREADY CONTIGUOUS IN THE CHUNK (guaranteed) |
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| 77 | so we just point to it where it lies. No moving of chars is |
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| 78 | needed and this is the second win: potentially long strings need |
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| 79 | never be explicitly shuffled. Once an object is formed, it does not |
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| 80 | change its address during its lifetime. |
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| 81 | |
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| 82 | When the chars burst over a chunk boundary, we allocate a larger |
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| 83 | chunk, and then copy the partly formed object from the end of the old |
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| 84 | chunk to the beginning of the new larger chunk. We then carry on |
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| 85 | accreting characters to the end of the object as we normally would. |
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| 86 | |
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| 87 | A special macro is provided to add a single char at a time to a |
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| 88 | growing object. This allows the use of register variables, which |
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| 89 | break the ordinary 'growth' macro. |
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| 90 | |
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| 91 | Summary: |
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| 92 | We allocate large chunks. |
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| 93 | We carve out one object at a time from the current chunk. |
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| 94 | Once carved, an object never moves. |
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| 95 | We are free to append data of any size to the currently |
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| 96 | growing object. |
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| 97 | Exactly one object is growing in an obstack at any one time. |
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| 98 | You can run one obstack per control block. |
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| 99 | You may have as many control blocks as you dare. |
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| 100 | Because of the way we do it, you can `unwind' an obstack |
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| 101 | back to a previous state. (You may remove objects much |
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| 102 | as you would with a stack.) |
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| 103 | */ |
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| 104 | |
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| 105 | |
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| 106 | /* Don't do the contents of this file more than once. */ |
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| 107 | |
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| 108 | #ifndef _OBSTACK_H |
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| 109 | #define _OBSTACK_H 1 |
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| 110 | |
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| 111 | #ifdef __cplusplus |
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| 112 | extern "C" { |
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| 113 | #endif |
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| 114 | |
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| 115 | /* We use subtraction of (char *) 0 instead of casting to int |
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| 116 | because on word-addressable machines a simple cast to int |
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| 117 | may ignore the byte-within-word field of the pointer. */ |
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| 118 | |
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| 119 | #ifndef __PTR_TO_INT |
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| 120 | # define __PTR_TO_INT(P) ((P) - (char *) 0) |
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| 121 | #endif |
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| 122 | |
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| 123 | #ifndef __INT_TO_PTR |
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| 124 | # define __INT_TO_PTR(P) ((P) + (char *) 0) |
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| 125 | #endif |
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| 126 | |
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| 127 | /* We need the type of the resulting object. If __PTRDIFF_TYPE__ is |
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| 128 | defined, as with GNU C, use that; that way we don't pollute the |
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| 129 | namespace with <stddef.h>'s symbols. Otherwise, if <stddef.h> is |
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| 130 | available, include it and use ptrdiff_t. In traditional C, long is |
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| 131 | the best that we can do. */ |
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| 132 | |
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| 133 | #ifdef __PTRDIFF_TYPE__ |
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| 134 | # define PTR_INT_TYPE __PTRDIFF_TYPE__ |
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| 135 | #else |
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| 136 | # ifdef HAVE_STDDEF_H |
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| 137 | # include <stddef.h> |
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| 138 | # define PTR_INT_TYPE ptrdiff_t |
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| 139 | # else |
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| 140 | # define PTR_INT_TYPE long |
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| 141 | # endif |
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| 142 | #endif |
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| 143 | |
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| 144 | #if defined _LIBC || defined HAVE_STRING_H |
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| 145 | # include <string.h> |
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| 146 | # define _obstack_memcpy(To, From, N) memcpy ((To), (From), (N)) |
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| 147 | #else |
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| 148 | # ifdef memcpy |
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| 149 | # define _obstack_memcpy(To, From, N) memcpy ((To), (From), (N)) |
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| 150 | # else |
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| 151 | # define _obstack_memcpy(To, From, N) bcopy ((From), (To), (N)) |
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| 152 | # endif |
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| 153 | #endif |
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| 154 | |
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| 155 | struct _obstack_chunk /* Lives at front of each chunk. */ |
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| 156 | { |
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| 157 | char *limit; /* 1 past end of this chunk */ |
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| 158 | struct _obstack_chunk *prev; /* address of prior chunk or NULL */ |
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| 159 | char contents[4]; /* objects begin here */ |
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| 160 | }; |
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| 161 | |
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| 162 | struct obstack /* control current object in current chunk */ |
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| 163 | { |
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| 164 | long chunk_size; /* preferred size to allocate chunks in */ |
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| 165 | struct _obstack_chunk *chunk; /* address of current struct obstack_chunk */ |
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| 166 | char *object_base; /* address of object we are building */ |
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| 167 | char *next_free; /* where to add next char to current object */ |
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| 168 | char *chunk_limit; /* address of char after current chunk */ |
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| 169 | PTR_INT_TYPE temp; /* Temporary for some macros. */ |
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| 170 | int alignment_mask; /* Mask of alignment for each object. */ |
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| 171 | #if defined __STDC__ && __STDC__ |
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| 172 | /* These prototypes vary based on `use_extra_arg', and we use |
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| 173 | casts to the prototypeless function type in all assignments, |
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| 174 | but having prototypes here quiets -Wstrict-prototypes. */ |
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| 175 | struct _obstack_chunk *(*chunkfun) (void *, long); |
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| 176 | void (*freefun) (void *, struct _obstack_chunk *); |
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| 177 | void *extra_arg; /* first arg for chunk alloc/dealloc funcs */ |
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| 178 | #else |
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| 179 | struct _obstack_chunk *(*chunkfun) (); /* User's fcn to allocate a chunk. */ |
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| 180 | void (*freefun) (); /* User's function to free a chunk. */ |
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| 181 | char *extra_arg; /* first arg for chunk alloc/dealloc funcs */ |
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| 182 | #endif |
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| 183 | unsigned use_extra_arg:1; /* chunk alloc/dealloc funcs take extra arg */ |
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| 184 | unsigned maybe_empty_object:1;/* There is a possibility that the current |
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| 185 | chunk contains a zero-length object. This |
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| 186 | prevents freeing the chunk if we allocate |
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| 187 | a bigger chunk to replace it. */ |
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| 188 | unsigned alloc_failed:1; /* No longer used, as we now call the failed |
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| 189 | handler on error, but retained for binary |
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| 190 | compatibility. */ |
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| 191 | }; |
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| 192 | |
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| 193 | /* Declare the external functions we use; they are in obstack.c. */ |
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| 194 | |
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| 195 | #if defined __STDC__ && __STDC__ |
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| 196 | extern void _obstack_newchunk (struct obstack *, int); |
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| 197 | extern void _obstack_free (struct obstack *, void *); |
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| 198 | extern int _obstack_begin (struct obstack *, int, int, |
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| 199 | void *(*) (long), void (*) (void *)); |
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| 200 | extern int _obstack_begin_1 (struct obstack *, int, int, |
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| 201 | void *(*) (void *, long), |
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| 202 | void (*) (void *, void *), void *); |
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| 203 | extern int _obstack_memory_used (struct obstack *); |
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| 204 | #else |
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| 205 | extern void _obstack_newchunk (); |
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| 206 | extern void _obstack_free (); |
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| 207 | extern int _obstack_begin (); |
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| 208 | extern int _obstack_begin_1 (); |
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| 209 | extern int _obstack_memory_used (); |
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| 210 | #endif |
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| 211 | |
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| 212 | #if defined __STDC__ && __STDC__ |
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| 213 | |
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| 214 | /* Do the function-declarations after the structs |
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| 215 | but before defining the macros. */ |
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| 216 | |
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| 217 | void obstack_init (struct obstack *obstack); |
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| 218 | |
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| 219 | void * obstack_alloc (struct obstack *obstack, int size); |
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| 220 | |
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[16930] | 221 | void * obstack_copy (struct obstack *obstack, const void *address, int size); |
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| 222 | void * obstack_copy0 (struct obstack *obstack, const void *address, int size); |
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[15273] | 223 | |
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| 224 | void obstack_free (struct obstack *obstack, void *block); |
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| 225 | |
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| 226 | void obstack_blank (struct obstack *obstack, int size); |
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| 227 | |
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[16930] | 228 | void obstack_grow (struct obstack *obstack, const void *data, int size); |
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| 229 | void obstack_grow0 (struct obstack *obstack, const void *data, int size); |
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[15273] | 230 | |
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| 231 | void obstack_1grow (struct obstack *obstack, int data_char); |
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[16930] | 232 | void obstack_ptr_grow (struct obstack *obstack, const void *data); |
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[15273] | 233 | void obstack_int_grow (struct obstack *obstack, int data); |
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| 234 | |
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| 235 | void * obstack_finish (struct obstack *obstack); |
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| 236 | |
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| 237 | int obstack_object_size (struct obstack *obstack); |
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| 238 | |
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| 239 | int obstack_room (struct obstack *obstack); |
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| 240 | void obstack_make_room (struct obstack *obstack, int size); |
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| 241 | void obstack_1grow_fast (struct obstack *obstack, int data_char); |
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[16930] | 242 | void obstack_ptr_grow_fast (struct obstack *obstack, const void *data); |
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[15273] | 243 | void obstack_int_grow_fast (struct obstack *obstack, int data); |
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| 244 | void obstack_blank_fast (struct obstack *obstack, int size); |
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| 245 | |
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| 246 | void * obstack_base (struct obstack *obstack); |
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| 247 | void * obstack_next_free (struct obstack *obstack); |
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| 248 | int obstack_alignment_mask (struct obstack *obstack); |
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| 249 | int obstack_chunk_size (struct obstack *obstack); |
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| 250 | int obstack_memory_used (struct obstack *obstack); |
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| 251 | |
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| 252 | #endif /* __STDC__ */ |
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| 253 | |
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| 254 | /* Non-ANSI C cannot really support alternative functions for these macros, |
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| 255 | so we do not declare them. */ |
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| 256 | |
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| 257 | /* Error handler called when `obstack_chunk_alloc' failed to allocate |
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[16930] | 258 | more memory. This can be set to a user defined function which |
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| 259 | should either abort gracefully or use longjump - but shouldn't |
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| 260 | return. The default action is to print a message and abort. */ |
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[15273] | 261 | #if defined __STDC__ && __STDC__ |
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| 262 | extern void (*obstack_alloc_failed_handler) (void); |
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| 263 | #else |
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| 264 | extern void (*obstack_alloc_failed_handler) (); |
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| 265 | #endif |
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| 266 | |
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| 267 | /* Exit value used when `print_and_abort' is used. */ |
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| 268 | extern int obstack_exit_failure; |
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| 269 | |
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| 270 | /* Pointer to beginning of object being allocated or to be allocated next. |
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| 271 | Note that this might not be the final address of the object |
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| 272 | because a new chunk might be needed to hold the final size. */ |
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| 273 | |
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| 274 | #define obstack_base(h) ((h)->object_base) |
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| 275 | |
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| 276 | /* Size for allocating ordinary chunks. */ |
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| 277 | |
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| 278 | #define obstack_chunk_size(h) ((h)->chunk_size) |
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| 279 | |
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| 280 | /* Pointer to next byte not yet allocated in current chunk. */ |
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| 281 | |
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| 282 | #define obstack_next_free(h) ((h)->next_free) |
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| 283 | |
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| 284 | /* Mask specifying low bits that should be clear in address of an object. */ |
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| 285 | |
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| 286 | #define obstack_alignment_mask(h) ((h)->alignment_mask) |
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| 287 | |
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| 288 | /* To prevent prototype warnings provide complete argument list in |
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| 289 | standard C version. */ |
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| 290 | #if defined __STDC__ && __STDC__ |
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| 291 | |
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| 292 | # define obstack_init(h) \ |
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| 293 | _obstack_begin ((h), 0, 0, \ |
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| 294 | (void *(*) (long)) obstack_chunk_alloc, (void (*) (void *)) obstack_chunk_free) |
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| 295 | |
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| 296 | # define obstack_begin(h, size) \ |
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| 297 | _obstack_begin ((h), (size), 0, \ |
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| 298 | (void *(*) (long)) obstack_chunk_alloc, (void (*) (void *)) obstack_chunk_free) |
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| 299 | |
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| 300 | # define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \ |
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| 301 | _obstack_begin ((h), (size), (alignment), \ |
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| 302 | (void *(*) (long)) (chunkfun), (void (*) (void *)) (freefun)) |
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| 303 | |
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| 304 | # define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \ |
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| 305 | _obstack_begin_1 ((h), (size), (alignment), \ |
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| 306 | (void *(*) (void *, long)) (chunkfun), \ |
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| 307 | (void (*) (void *, void *)) (freefun), (arg)) |
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| 308 | |
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| 309 | # define obstack_chunkfun(h, newchunkfun) \ |
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| 310 | ((h) -> chunkfun = (struct _obstack_chunk *(*)(void *, long)) (newchunkfun)) |
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| 311 | |
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| 312 | # define obstack_freefun(h, newfreefun) \ |
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| 313 | ((h) -> freefun = (void (*)(void *, struct _obstack_chunk *)) (newfreefun)) |
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| 314 | |
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| 315 | #else |
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| 316 | |
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| 317 | # define obstack_init(h) \ |
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| 318 | _obstack_begin ((h), 0, 0, \ |
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| 319 | (void *(*) ()) obstack_chunk_alloc, (void (*) ()) obstack_chunk_free) |
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| 320 | |
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| 321 | # define obstack_begin(h, size) \ |
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| 322 | _obstack_begin ((h), (size), 0, \ |
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| 323 | (void *(*) ()) obstack_chunk_alloc, (void (*) ()) obstack_chunk_free) |
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| 324 | |
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| 325 | # define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \ |
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| 326 | _obstack_begin ((h), (size), (alignment), \ |
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| 327 | (void *(*) ()) (chunkfun), (void (*) ()) (freefun)) |
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| 328 | |
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| 329 | # define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \ |
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| 330 | _obstack_begin_1 ((h), (size), (alignment), \ |
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| 331 | (void *(*) ()) (chunkfun), (void (*) ()) (freefun), (arg)) |
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| 332 | |
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| 333 | # define obstack_chunkfun(h, newchunkfun) \ |
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| 334 | ((h) -> chunkfun = (struct _obstack_chunk *(*)()) (newchunkfun)) |
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| 335 | |
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| 336 | # define obstack_freefun(h, newfreefun) \ |
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| 337 | ((h) -> freefun = (void (*)()) (newfreefun)) |
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| 338 | |
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| 339 | #endif |
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| 340 | |
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| 341 | #define obstack_1grow_fast(h,achar) (*((h)->next_free)++ = achar) |
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| 342 | |
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| 343 | #define obstack_blank_fast(h,n) ((h)->next_free += (n)) |
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| 344 | |
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| 345 | #define obstack_memory_used(h) _obstack_memory_used (h) |
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| 346 | |
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| 347 | #if defined __GNUC__ && defined __STDC__ && __STDC__ |
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| 348 | /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and |
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| 349 | does not implement __extension__. But that compiler doesn't define |
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| 350 | __GNUC_MINOR__. */ |
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| 351 | # if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__) |
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| 352 | # define __extension__ |
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| 353 | # endif |
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| 354 | |
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| 355 | /* For GNU C, if not -traditional, |
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| 356 | we can define these macros to compute all args only once |
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| 357 | without using a global variable. |
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| 358 | Also, we can avoid using the `temp' slot, to make faster code. */ |
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| 359 | |
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| 360 | # define obstack_object_size(OBSTACK) \ |
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| 361 | __extension__ \ |
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| 362 | ({ struct obstack *__o = (OBSTACK); \ |
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| 363 | (unsigned) (__o->next_free - __o->object_base); }) |
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| 364 | |
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| 365 | # define obstack_room(OBSTACK) \ |
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| 366 | __extension__ \ |
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| 367 | ({ struct obstack *__o = (OBSTACK); \ |
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| 368 | (unsigned) (__o->chunk_limit - __o->next_free); }) |
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| 369 | |
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| 370 | # define obstack_make_room(OBSTACK,length) \ |
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| 371 | __extension__ \ |
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| 372 | ({ struct obstack *__o = (OBSTACK); \ |
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| 373 | int __len = (length); \ |
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| 374 | if (__o->chunk_limit - __o->next_free < __len) \ |
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| 375 | _obstack_newchunk (__o, __len); \ |
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| 376 | (void) 0; }) |
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| 377 | |
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| 378 | # define obstack_empty_p(OBSTACK) \ |
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| 379 | __extension__ \ |
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| 380 | ({ struct obstack *__o = (OBSTACK); \ |
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| 381 | (__o->chunk->prev == 0 && __o->next_free - __o->chunk->contents == 0); }) |
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| 382 | |
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| 383 | # define obstack_grow(OBSTACK,where,length) \ |
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| 384 | __extension__ \ |
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| 385 | ({ struct obstack *__o = (OBSTACK); \ |
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| 386 | int __len = (length); \ |
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| 387 | if (__o->next_free + __len > __o->chunk_limit) \ |
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| 388 | _obstack_newchunk (__o, __len); \ |
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[16930] | 389 | _obstack_memcpy (__o->next_free, (const char *) (where), __len); \ |
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[15273] | 390 | __o->next_free += __len; \ |
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| 391 | (void) 0; }) |
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| 392 | |
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| 393 | # define obstack_grow0(OBSTACK,where,length) \ |
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| 394 | __extension__ \ |
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| 395 | ({ struct obstack *__o = (OBSTACK); \ |
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| 396 | int __len = (length); \ |
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| 397 | if (__o->next_free + __len + 1 > __o->chunk_limit) \ |
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| 398 | _obstack_newchunk (__o, __len + 1); \ |
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[16930] | 399 | _obstack_memcpy (__o->next_free, (const char *) (where), __len); \ |
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[15273] | 400 | __o->next_free += __len; \ |
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| 401 | *(__o->next_free)++ = 0; \ |
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| 402 | (void) 0; }) |
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| 403 | |
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| 404 | # define obstack_1grow(OBSTACK,datum) \ |
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| 405 | __extension__ \ |
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| 406 | ({ struct obstack *__o = (OBSTACK); \ |
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| 407 | if (__o->next_free + 1 > __o->chunk_limit) \ |
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| 408 | _obstack_newchunk (__o, 1); \ |
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| 409 | *(__o->next_free)++ = (datum); \ |
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| 410 | (void) 0; }) |
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| 411 | |
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| 412 | /* These assume that the obstack alignment is good enough for pointers or ints, |
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| 413 | and that the data added so far to the current object |
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| 414 | shares that much alignment. */ |
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| 415 | |
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| 416 | # define obstack_ptr_grow(OBSTACK,datum) \ |
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| 417 | __extension__ \ |
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| 418 | ({ struct obstack *__o = (OBSTACK); \ |
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| 419 | if (__o->next_free + sizeof (void *) > __o->chunk_limit) \ |
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| 420 | _obstack_newchunk (__o, sizeof (void *)); \ |
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[16930] | 421 | *((void **)__o->next_free)++ = ((const void *)datum); \ |
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[15273] | 422 | (void) 0; }) |
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| 423 | |
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| 424 | # define obstack_int_grow(OBSTACK,datum) \ |
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| 425 | __extension__ \ |
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| 426 | ({ struct obstack *__o = (OBSTACK); \ |
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| 427 | if (__o->next_free + sizeof (int) > __o->chunk_limit) \ |
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| 428 | _obstack_newchunk (__o, sizeof (int)); \ |
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| 429 | *((int *)__o->next_free)++ = ((int)datum); \ |
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| 430 | (void) 0; }) |
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| 431 | |
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| 432 | # define obstack_ptr_grow_fast(h,aptr) (*((void **) (h)->next_free)++ = (void *)aptr) |
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| 433 | # define obstack_int_grow_fast(h,aint) (*((int *) (h)->next_free)++ = (int) aint) |
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| 434 | |
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| 435 | # define obstack_blank(OBSTACK,length) \ |
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| 436 | __extension__ \ |
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| 437 | ({ struct obstack *__o = (OBSTACK); \ |
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| 438 | int __len = (length); \ |
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| 439 | if (__o->chunk_limit - __o->next_free < __len) \ |
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| 440 | _obstack_newchunk (__o, __len); \ |
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| 441 | __o->next_free += __len; \ |
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| 442 | (void) 0; }) |
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| 443 | |
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| 444 | # define obstack_alloc(OBSTACK,length) \ |
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| 445 | __extension__ \ |
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| 446 | ({ struct obstack *__h = (OBSTACK); \ |
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| 447 | obstack_blank (__h, (length)); \ |
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| 448 | obstack_finish (__h); }) |
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| 449 | |
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| 450 | # define obstack_copy(OBSTACK,where,length) \ |
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| 451 | __extension__ \ |
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| 452 | ({ struct obstack *__h = (OBSTACK); \ |
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| 453 | obstack_grow (__h, (where), (length)); \ |
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| 454 | obstack_finish (__h); }) |
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| 455 | |
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| 456 | # define obstack_copy0(OBSTACK,where,length) \ |
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| 457 | __extension__ \ |
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| 458 | ({ struct obstack *__h = (OBSTACK); \ |
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| 459 | obstack_grow0 (__h, (where), (length)); \ |
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| 460 | obstack_finish (__h); }) |
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| 461 | |
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| 462 | /* The local variable is named __o1 to avoid a name conflict |
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| 463 | when obstack_blank is called. */ |
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| 464 | # define obstack_finish(OBSTACK) \ |
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| 465 | __extension__ \ |
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| 466 | ({ struct obstack *__o1 = (OBSTACK); \ |
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| 467 | void *value; \ |
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| 468 | value = (void *) __o1->object_base; \ |
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| 469 | if (__o1->next_free == value) \ |
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| 470 | __o1->maybe_empty_object = 1; \ |
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| 471 | __o1->next_free \ |
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| 472 | = __INT_TO_PTR ((__PTR_TO_INT (__o1->next_free)+__o1->alignment_mask)\ |
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| 473 | & ~ (__o1->alignment_mask)); \ |
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| 474 | if (__o1->next_free - (char *)__o1->chunk \ |
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| 475 | > __o1->chunk_limit - (char *)__o1->chunk) \ |
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| 476 | __o1->next_free = __o1->chunk_limit; \ |
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| 477 | __o1->object_base = __o1->next_free; \ |
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| 478 | value; }) |
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| 479 | |
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| 480 | # define obstack_free(OBSTACK, OBJ) \ |
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| 481 | __extension__ \ |
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| 482 | ({ struct obstack *__o = (OBSTACK); \ |
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| 483 | void *__obj = (OBJ); \ |
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| 484 | if (__obj > (void *)__o->chunk && __obj < (void *)__o->chunk_limit) \ |
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[16930] | 485 | __o->next_free = __o->object_base = (char *)__obj; \ |
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[15273] | 486 | else (obstack_free) (__o, __obj); }) |
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| 487 | |
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| 488 | #else /* not __GNUC__ or not __STDC__ */ |
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| 489 | |
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| 490 | # define obstack_object_size(h) \ |
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| 491 | (unsigned) ((h)->next_free - (h)->object_base) |
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| 492 | |
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| 493 | # define obstack_room(h) \ |
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| 494 | (unsigned) ((h)->chunk_limit - (h)->next_free) |
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| 495 | |
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| 496 | # define obstack_empty_p(h) \ |
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| 497 | ((h)->chunk->prev == 0 && (h)->next_free - (h)->chunk->contents == 0) |
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| 498 | |
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| 499 | /* Note that the call to _obstack_newchunk is enclosed in (..., 0) |
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| 500 | so that we can avoid having void expressions |
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| 501 | in the arms of the conditional expression. |
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| 502 | Casting the third operand to void was tried before, |
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| 503 | but some compilers won't accept it. */ |
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| 504 | |
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| 505 | # define obstack_make_room(h,length) \ |
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| 506 | ( (h)->temp = (length), \ |
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| 507 | (((h)->next_free + (h)->temp > (h)->chunk_limit) \ |
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| 508 | ? (_obstack_newchunk ((h), (h)->temp), 0) : 0)) |
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| 509 | |
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| 510 | # define obstack_grow(h,where,length) \ |
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| 511 | ( (h)->temp = (length), \ |
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| 512 | (((h)->next_free + (h)->temp > (h)->chunk_limit) \ |
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| 513 | ? (_obstack_newchunk ((h), (h)->temp), 0) : 0), \ |
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| 514 | _obstack_memcpy ((h)->next_free, (char *) (where), (h)->temp), \ |
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| 515 | (h)->next_free += (h)->temp) |
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| 516 | |
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| 517 | # define obstack_grow0(h,where,length) \ |
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| 518 | ( (h)->temp = (length), \ |
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| 519 | (((h)->next_free + (h)->temp + 1 > (h)->chunk_limit) \ |
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| 520 | ? (_obstack_newchunk ((h), (h)->temp + 1), 0) : 0), \ |
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| 521 | _obstack_memcpy ((h)->next_free, (char *) (where), (h)->temp), \ |
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| 522 | (h)->next_free += (h)->temp, \ |
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| 523 | *((h)->next_free)++ = 0) |
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| 524 | |
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| 525 | # define obstack_1grow(h,datum) \ |
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| 526 | ( (((h)->next_free + 1 > (h)->chunk_limit) \ |
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| 527 | ? (_obstack_newchunk ((h), 1), 0) : 0), \ |
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| 528 | (*((h)->next_free)++ = (datum))) |
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| 529 | |
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| 530 | # define obstack_ptr_grow(h,datum) \ |
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| 531 | ( (((h)->next_free + sizeof (char *) > (h)->chunk_limit) \ |
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| 532 | ? (_obstack_newchunk ((h), sizeof (char *)), 0) : 0), \ |
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| 533 | (*((char **) (((h)->next_free+=sizeof(char *))-sizeof(char *))) = ((char *) datum))) |
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| 534 | |
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| 535 | # define obstack_int_grow(h,datum) \ |
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| 536 | ( (((h)->next_free + sizeof (int) > (h)->chunk_limit) \ |
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| 537 | ? (_obstack_newchunk ((h), sizeof (int)), 0) : 0), \ |
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| 538 | (*((int *) (((h)->next_free+=sizeof(int))-sizeof(int))) = ((int) datum))) |
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| 539 | |
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| 540 | # define obstack_ptr_grow_fast(h,aptr) (*((char **) (h)->next_free)++ = (char *) aptr) |
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| 541 | # define obstack_int_grow_fast(h,aint) (*((int *) (h)->next_free)++ = (int) aint) |
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| 542 | |
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| 543 | # define obstack_blank(h,length) \ |
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| 544 | ( (h)->temp = (length), \ |
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| 545 | (((h)->chunk_limit - (h)->next_free < (h)->temp) \ |
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| 546 | ? (_obstack_newchunk ((h), (h)->temp), 0) : 0), \ |
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| 547 | ((h)->next_free += (h)->temp)) |
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| 548 | |
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| 549 | # define obstack_alloc(h,length) \ |
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| 550 | (obstack_blank ((h), (length)), obstack_finish ((h))) |
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| 551 | |
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| 552 | # define obstack_copy(h,where,length) \ |
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| 553 | (obstack_grow ((h), (where), (length)), obstack_finish ((h))) |
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| 554 | |
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| 555 | # define obstack_copy0(h,where,length) \ |
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| 556 | (obstack_grow0 ((h), (where), (length)), obstack_finish ((h))) |
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| 557 | |
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| 558 | # define obstack_finish(h) \ |
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| 559 | ( ((h)->next_free == (h)->object_base \ |
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| 560 | ? (((h)->maybe_empty_object = 1), 0) \ |
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| 561 | : 0), \ |
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| 562 | (h)->temp = __PTR_TO_INT ((h)->object_base), \ |
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| 563 | (h)->next_free \ |
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| 564 | = __INT_TO_PTR ((__PTR_TO_INT ((h)->next_free)+(h)->alignment_mask) \ |
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| 565 | & ~ ((h)->alignment_mask)), \ |
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| 566 | (((h)->next_free - (char *) (h)->chunk \ |
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| 567 | > (h)->chunk_limit - (char *) (h)->chunk) \ |
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| 568 | ? ((h)->next_free = (h)->chunk_limit) : 0), \ |
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| 569 | (h)->object_base = (h)->next_free, \ |
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| 570 | __INT_TO_PTR ((h)->temp)) |
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| 571 | |
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| 572 | # if defined __STDC__ && __STDC__ |
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| 573 | # define obstack_free(h,obj) \ |
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| 574 | ( (h)->temp = (char *) (obj) - (char *) (h)->chunk, \ |
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| 575 | (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\ |
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| 576 | ? (int) ((h)->next_free = (h)->object_base \ |
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| 577 | = (h)->temp + (char *) (h)->chunk) \ |
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| 578 | : (((obstack_free) ((h), (h)->temp + (char *) (h)->chunk), 0), 0))) |
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| 579 | # else |
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| 580 | # define obstack_free(h,obj) \ |
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| 581 | ( (h)->temp = (char *) (obj) - (char *) (h)->chunk, \ |
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| 582 | (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\ |
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| 583 | ? (int) ((h)->next_free = (h)->object_base \ |
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| 584 | = (h)->temp + (char *) (h)->chunk) \ |
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| 585 | : (_obstack_free ((h), (h)->temp + (char *) (h)->chunk), 0))) |
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| 586 | # endif |
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| 587 | |
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| 588 | #endif /* not __GNUC__ or not __STDC__ */ |
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| 589 | |
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| 590 | #ifdef __cplusplus |
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| 591 | } /* C++ */ |
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| 592 | #endif |
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| 593 | |
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| 594 | #endif /* obstack.h */ |
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